Quote:
Originally Posted by MTTH
I just got this same code, 128901. The car has 14K miles on it & is stock other than an MST intake & one resonator delete. I filled up with 93 Oct & 1 gallon of e85 2 days ago if that makes a difference.
Not sure what would cause this code. I cleared it but I haven't driven it to see if it comes back.
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e85 is probably fouling your upstream. If it comes back, you may need to replace your upstream O2 sensor.